Use and Care Manual

11
Figure 10: Achieving accurate angles using a
machinist’s protractor
7.5 Using the miter system
The miter slot in the table allows you to use a miter
gauge to grind angles on workpieces. Use the
following procedure:
1. Put the table in a level position. Use the table
tilt mechanism to adjust it, if necessary.
2. Loosen the lock knob on the miter gauge.
3. Adjust the miter gauge to the angle you want
to cut.
4. Lock the lock knob on the miter gauge.
5. Put the miter gauge in its miter slot on the
table.
6. Turn the grinder ON and allow the motor and
disc to come up to full speed.
7. Hold the reference edge of the workpiece
against the miter gauge face and move the
workpiece into contact with the abrasive disc.
8. Allow the workpiece to slide forward, along the
face of the miter gauge, until the required
depth of cut has been achieved.
Figure 11 shows how to set and use the miter
gauge to grind a simple angle on a workpiece. To
grind a compound angle you can set the miter
gauge to one required angle and set the table tilt to
a second required angle, thus achieving the
compound angle desired. Remember: When
grinding complex compound angles, always test
your table and miter set-up on scrap material
before attempting a finish machining task on the
actual part you will be grinding.
Figure 11: Use of the miter system
8.0 Recommended abrasives
By using different abrasive types and different
weights of grit it is possible to produce a very wide
variety of cutting speeds and surface finishes on a
very wide range of materials – from metals, to
plastics, to wood.
The following information is provided as a general
guide to the types of discs appropriate to many
materials. Your industrial distributor may be able to
provide you with special abrasive discs for specific
production applications. And of course, your
workpiece supplier should be consulted for
recommendations, as well.
Aluminum Oxide
Aluminum oxide is available in cloth backed discs
in a very wide range of grits – typically from 24
(extremely aggressive) to 400 (almost a polishing
grade.) Aluminum oxide is suitable for use on
virtually all materials – ferrous and non-ferrous.
The list of materials appropriate for aluminum oxide
cutting includes low, medium and high carbon/alloy
steels, brass, aluminum, bronze, copper and
titanium.
Garnet
Garnet is available in a cloth backed disc, typically
in a range of grits from 80 to 220. Garnet is a
material used almost exclusively on wood. This
makes it appropriate to shops such as pattern
shops. It has the beneficial property of grit
fracturing at low pressure levels. This quick
renewal of the cutting surface results in more rapid
wear-out of the disc, of course. But it also allows
very low temperature sanding of wood – thus
permitting rapid sanding without burns. This is
particularly beneficial when doing sanding on end
grains.